Though they may seem antiquated and unnecessary, knowing the proper hand driving-signals can be a lifesaver if your turn signals or brake lights fail. But unless youâre a centenarian, a driving test instructor, or both (highly unlikely), you might not remember how hand driving-signals work.
Climate Data. Standardized Precipitation Index (SPI) The Standardized Precipitation Index (SPI) is a widely used index to characterize meteorological drought on a range of timescales. On short timescales, the SPI is closely related to soil moisture, while at longer timescales, the SPI can be related to groundwater and reservoir storage.
The total cost of doing business with the supplier can be calculated by the supplier performance index (SPI). This index is calculated for each item or commodity provided by the supplier and has a base value of 1.